github.com/lovishpuri/go-40569/src@v0.0.0-20230519171745-f8623e7c56cf/runtime/cgo/asm_386.s (about) 1 // Copyright 2009 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 #include "textflag.h" 6 7 // Set the x_crosscall2_ptr C function pointer variable point to crosscall2. 8 // It's such a pointer chain: _crosscall2_ptr -> x_crosscall2_ptr -> crosscall2 9 TEXT ·set_crosscall2(SB),NOSPLIT,$0-0 10 MOVL _crosscall2_ptr(SB), AX 11 MOVL $crosscall2(SB), BX 12 MOVL BX, (AX) 13 RET 14 15 // Called by C code generated by cmd/cgo. 16 // func crosscall2(fn, a unsafe.Pointer, n int32, ctxt uintptr) 17 // Saves C callee-saved registers and calls cgocallback with three arguments. 18 // fn is the PC of a func(a unsafe.Pointer) function. 19 TEXT crosscall2(SB),NOSPLIT,$28-16 20 MOVL BP, 24(SP) 21 MOVL BX, 20(SP) 22 MOVL SI, 16(SP) 23 MOVL DI, 12(SP) 24 25 MOVL ctxt+12(FP), AX 26 MOVL AX, 8(SP) 27 MOVL a+4(FP), AX 28 MOVL AX, 4(SP) 29 MOVL fn+0(FP), AX 30 MOVL AX, 0(SP) 31 CALL runtime·cgocallback(SB) 32 33 MOVL 12(SP), DI 34 MOVL 16(SP), SI 35 MOVL 20(SP), BX 36 MOVL 24(SP), BP 37 RET